How to Use
Select your preferred unit system - Metric (kg, cm) or Imperial (lbs, ft/in).
Enter your current weight and height in the fields provided.
Click Calculate to instantly see your BMI score.
Review your BMI category (Underweight, Normal, Overweight, or Obese) on the color-coded gauge.
Read the on-screen guidance to understand what your result means for your health.
Consult a healthcare professional if your BMI falls outside the Normal range or if you have concerns about body composition.
What Is This Tool?
Body Mass Index (BMI) is a number calculated from your weight and height that provides a quick snapshot of whether your body weight falls within a healthy range. It is widely used by clinicians and researchers as a low-cost screening tool to flag potential weight-related health risks. However, BMI has real limitations: it cannot distinguish between muscle mass and fat mass, so a muscular athlete may be classified as "overweight" despite having very low body fat. BMI also does not account for where fat is distributed on the body - abdominal fat carries different health risks than fat stored elsewhere. Researchers note that BMI thresholds developed from European populations may not apply equally across all ethnic groups. For a fuller picture of body composition, consider waist circumference, waist-to-hip ratio, or a DEXA scan alongside your BMI.
Why It Matters
Maintaining a healthy BMI reduces the risk of type 2 diabetes, cardiovascular disease, hypertension, sleep apnea, and several cancers. Even modest weight loss of 5–10% of body weight in people who are overweight can meaningfully lower blood pressure, improve insulin sensitivity, and reduce joint strain. Tracking BMI over time gives you an objective reference point for monitoring the effect of lifestyle changes - independent of how you feel day to day.